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authorLuke Shumaker <LukeShu@sbcglobal.net>2013-10-07 16:08:00 -0400
committerLuke Shumaker <LukeShu@sbcglobal.net>2013-10-07 16:08:00 -0400
commit8cce4095d3465863fcb26b7264371d97db31990a (patch)
tree2a98580947ff400dc70161f00b9f77497af92d15 /config.mk
parentc366cd83bb86440dcc15a2203df57be75ff3f11f (diff)
revert last commit, it makes systemd-nspawn not handle signals correctly.
I'm a fan of systemd-nspawn. I really am. It handles a lot of things the "right" way, so you don't have to. However, it handles PTYs and signals in an incredibly stupid way. Working around one is f---ed up by the other being wrong. Before I implemented the change that this reverts, this is what happens: systemd-nspawn> I need to create a PTY and proxy between it and stdio. I can specify a terminal size when doing this--I should set it to reflect the terminal I am connected to. systemd-nspawn> /dev/stdout: Are you a TTY? /dev/stdout> systemd-nspawn: No. ---- The correct thing to do here would be to either not set the size, ---- or set it to 80×24 systemd-nspawn> /dev/stdin: Are you a TTY? /dev/stdin> systemd-nspawn: Yes. systemd-nspawn> /dev/stdin: Great, what size are you? /dev/stdin> systemd-nspawn: I am X×Y. systemd-nspawn: libc: Please give me a PTY that is X×Y. ---- Why the f--- would you do this? The size only effects *output*. ---- If you don't know the characteristics of the output, set ---- reasonable defaults! Don't base it on the characteristics of the ---- input! My solution was to make /dev/stdin not be a TTY by closing it. This had the desired effect, but tripped up the signal handling. Here is how signals were handled before: systemd-nspawn> /dev/stdin: Are you a TTY? /dev/stdin> systemd-nspawn: Yes. systemd-nspawn> /dev/stdin: Great, please don't send SIGINT on C-c. I will handle it myself. *user presses C-c, systemd reads it* systemd-nspawn> child processes: here's a SIGINT. Here's what happens when I close, or do other things to make stdin not be a TTY: systemd-nspawn> /dev/stdin: Are you a TTY? /dev/stdin> systemd-nspawn: No. systemd-nspawn> /dev/stdin: Oh, OK. *user presses C-c, /dev/stdin interprets it* /dev/stdin> systemd-nspawn: Here's a SIGINT. systemd-nspawn> *dies, abandoning child processes* The clear correct thing to do would have been to *handle* SIGINT, and pass it along to the children.
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